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lms coil question
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<blockquote data-quote="Electrodynamic" data-source="post: 4439102" data-attributes="member: 548723"><p><strong> </strong></p><p></p><p><strong>Kyle, as you stated in the first section of your post, I was simply stating what LMS was for the forum readers...nothing more. I suppose it was my preference sentence that tipped off the rest of your reply. </strong></p><p></p><p><strong> </strong></p><p></p><p><strong>And actually Kyle, you got it kind of backwards. </strong>//content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif</p><p></p><p><strong> </strong></p><p></p><p><strong>XBL^2 does NOT "throw away" B. You only lose B </strong><strong>IF AND ONLY IF</strong><strong> the steel lining the gap is saturated; if the steel lining the gap is not saturated, then the flux will move from the rebate </strong><strong>TO</strong><strong> the two (or more) smaller gaps. It's like putting a rock in the middle of a small stream - the flow of water goes around the rock, it doesn't just stop. I understand where you're coming from thinking that the rebate immediately looses B, but that's just not the case. The fringe field between the two gaps (XBL^2) tends to be a lot higher than the outside fringe field. And the presence of that field will tend to move the outside-the-gap field into the between-the-gaps field, which is, in fact, integrated. </strong></p><p></p><p><strong> </strong></p><p></p><p><strong>Also, even considering the 12.5 mm gap that you mentioned in your following post (the picture looks to be close to that), the SICKO project utilizes a 5 mm gap and our new Mag utilizes a 3.05 mm gap. I'm a little lost as to where you're referencing XBL^2 to have a "wider gap." </strong></p><p></p><p><strong> </strong></p><p></p><p><strong>And while I'm on the SICKO reference, keep in mind that that monster manages to do 55 mm of one-way linear stroke with a 41 mm tall coil (just over 1.5" long)! Now, the SICKO is 41 mm one-way with a 1% drop, compared that to the 30 mm 1% linear threshold of the LMS which had a 38 mm total linear stroke. Coil comparison alone, the LMS is 60% longer than the SICKO, thus, higher moving mass.</strong></p><p></p><p><strong> </strong></p><p></p><p><strong>So just for $hits and giggles lets compare the new Mag to the LMS. (Scary huh?!) The new Mag has a coil that is 18.4 mm long, yet has half the linear stroke of the LMS! So we've got 1/3 the length and 1/2 the stroke. If we had the same stroke - scaled up - we'd have 2/3 the length for the same level of stroke. Not to mention a much shallower driver. </strong></p><p></p><p><strong> </strong></p><p></p><p><strong>Now, Mark, inductance. I would like you to reference the paper we have posted on our web site and forum located </strong><a href="http://stereointegrity.com/docs/WooferSpeed.pdf" target="_blank"><strong>here</strong></a><strong> and then reply again. Are you saying that after reading that document (that shows with Klippel results that inductance </strong><strong><em>DOES</em></strong><strong> have an impact on transient response) that inductance does not have an impact on transient response? </strong></p><p></p><p><strong> </strong></p><p></p><p><strong>Inductance is concerned with the diameter of the voice coil and the number of turns. Going with 8 layers of flat wound (as Kyle described) actually HURTS you from an inductance stand point! Doubling the layers means twice the number of turns, meaning a 4X increase in inductance.</strong></p><p></p><p><strong> </strong></p><p></p><p><strong>I like LMS in the fact that it does increase linear stroke. But I'd like to see it do 20 mm of one-way linear within 54 mm of total height. </strong></p><p></p><p><strong> </strong></p><p></p><p><strong>IMHO XBL^2 is superior in terms of driver depth, lower inductance, and more linear stroke-per-coil height. Not to mention the split coil XBL^2 offerings (like the Parthenon)!</strong></p><p></p><p><strong> </strong></p><p></p><p><strong>But then again, I'm bias.</strong></p></blockquote><p></p>
[QUOTE="Electrodynamic, post: 4439102, member: 548723"] [B] [/B] [B]Kyle, as you stated in the first section of your post, I was simply stating what LMS was for the forum readers...nothing more. I suppose it was my preference sentence that tipped off the rest of your reply. [/B] [B] [/B] [B]And actually Kyle, you got it kind of backwards. [/B][IMG]//content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif[/IMG] [B] [/B] [B]XBL^2 does NOT "throw away" B. You only lose B [/B][B]IF AND ONLY IF[/B][B] the steel lining the gap is saturated; if the steel lining the gap is not saturated, then the flux will move from the rebate [/B][B]TO[/B][B] the two (or more) smaller gaps. It's like putting a rock in the middle of a small stream - the flow of water goes around the rock, it doesn't just stop. I understand where you're coming from thinking that the rebate immediately looses B, but that's just not the case. The fringe field between the two gaps (XBL^2) tends to be a lot higher than the outside fringe field. And the presence of that field will tend to move the outside-the-gap field into the between-the-gaps field, which is, in fact, integrated. [/B] [B] [/B] [B]Also, even considering the 12.5 mm gap that you mentioned in your following post (the picture looks to be close to that), the SICKO project utilizes a 5 mm gap and our new Mag utilizes a 3.05 mm gap. I'm a little lost as to where you're referencing XBL^2 to have a "wider gap." [/B] [B] [/B] [B]And while I'm on the SICKO reference, keep in mind that that monster manages to do 55 mm of one-way linear stroke with a 41 mm tall coil (just over 1.5" long)! Now, the SICKO is 41 mm one-way with a 1% drop, compared that to the 30 mm 1% linear threshold of the LMS which had a 38 mm total linear stroke. Coil comparison alone, the LMS is 60% longer than the SICKO, thus, higher moving mass.[/B] [B] [/B] [B]So just for $hits and giggles lets compare the new Mag to the LMS. (Scary huh?!) The new Mag has a coil that is 18.4 mm long, yet has half the linear stroke of the LMS! So we've got 1/3 the length and 1/2 the stroke. If we had the same stroke - scaled up - we'd have 2/3 the length for the same level of stroke. Not to mention a much shallower driver. [/B] [B] [/B] [B]Now, Mark, inductance. I would like you to reference the paper we have posted on our web site and forum located [/B][URL="http://stereointegrity.com/docs/WooferSpeed.pdf"][B]here[/B][/URL][B] and then reply again. Are you saying that after reading that document (that shows with Klippel results that inductance [/B][B][I]DOES[/I][/B][B] have an impact on transient response) that inductance does not have an impact on transient response? [/B] [B] [/B] [B]Inductance is concerned with the diameter of the voice coil and the number of turns. Going with 8 layers of flat wound (as Kyle described) actually HURTS you from an inductance stand point! Doubling the layers means twice the number of turns, meaning a 4X increase in inductance.[/B] [B] [/B] [B]I like LMS in the fact that it does increase linear stroke. But I'd like to see it do 20 mm of one-way linear within 54 mm of total height. [/B] [B] [/B] [B]IMHO XBL^2 is superior in terms of driver depth, lower inductance, and more linear stroke-per-coil height. Not to mention the split coil XBL^2 offerings (like the Parthenon)![/B] [B] [/B] [B]But then again, I'm bias.[/B] [/QUOTE]
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